Data through September 2026 · updated 19 Oct 2026
797 building permits were issued in ZIP code 20866 by Montgomery County Department of Permitting Services, October 2024 through September 2026: 1% of the 57,855 in Montgomery County, the 27th busiest ZIP code. HVAC permits lead with 256. 361 permits in the last 12 months (Oct 2025–Sep 2026), 17% fewer than the 436 in the 12 months before. Permits from a city that runs its own permit office are not counted.
Share here is the part of the 797 permits in 20866; countywide is the same for all of Montgomery County.
| Kind of work | Permits | Share here | Countywide |
|---|---|---|---|
| HVAC | 256 | 32% | 27% |
| Electrical | 236 | 30% | 38% |
| Solar | 173 | 22% | 14% |
| Garages, sheds & shade structures | 30 | 4% | 4% |
| Remodels & repairs | 17 | 2% | 5% |
| Additions | 9 | 1% | 3% |
| New homes | 7 | under 1% | 3% |
| ADUs & casitas | 5 | under 1% | under 1% |
| Fences & walls | 3 | under 1% | under 1% |
| Pools & spas | 1 | under 1% | under 1% |
| Other | 60 | 8% | 5% |
Permits issued in each calendar year of the window.
| Year | Months | Permits | Per year |
|---|---|---|---|
| 2024 (from October) | 3 | 96 | 384 |
| 2025 | 12 | 435 | 435 |
| 2026 (through September) | 9 | 266 | 355 |
Permits issued Oct 2024–Sep 2025, at least 12 months before the file ends.
| Measure | 20866 | Countywide |
|---|---|---|
| Permits issued Oct 2024–Sep 2025 | 436 | 28,829 |
| Finished | 77.8% | 77.4% |
| Usual days, issue to final | 76 | 69 |
Source: dataMontgomery: Residential Permit, Commercial Permits, Mechanical Permits and Electrical Building Permits (Department of Permitting Services), read 19 Oct 2026. We count permits issued October 2024 through September 2026; denied and withdrawn permits are left out.
Building, electrical and mechanical permits issued by the Montgomery County Department of Permitting Services, which covers the county outside the cities that run their own building offices: Silver Spring, Bethesda, Potomac, Germantown, Clarksburg, Chevy Chase, Olney, Wheaton, Takoma Park and the rest. The cities of Rockville and Gaithersburg issue most of their own building permits, so permits inside those cities are largely missing; a Rockville or Gaithersburg mailing address in this file is usually just outside those cities. Plumbing and gas-service permits are issued by WSSC Water, not the county, and are not in the file.
Counts are permits, not jobs: one job can need several permits. Nobody paid to be on this page and nobody can. Sources and definitions →
Free to reuse with attribution (CC BY 4.0). Please credit Contractor Records and link to this page. Suggested citation:
Contractor Records, "Building permits in 20866, Montgomery County", https://contractorrecords.com/montgomery-county-md/zip/20866, data through September 2026, from Montgomery County Department of Permitting Services building-permit records.Link to a table: By kind of work · By year · How permits finish.
Download the tables (CSV): Permits in 20866 by kind of work · Permits in 20866 by year · Permits in 20866: finished and days to final.